Case for a wristwatch



FIG. 1 is a left-front perspective view of a case for a wristwatchshowing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the rear being a mirrorimage thereto;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof.

The ornamental design for a case for a wristwatch, as shown anddescribed.